JP2002051209A - Image reducing method, image processor and control method for the processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reducing method, an image processor and a control method for the same, with which device costs can be reduced when applying conditional OR processing to reducing processing in a subscanning direction. SOLUTION: Since an image is reduced in the subscanning direction by conditional OR processing and a magnification point to be determined corresponding to a reduction rate is limited only to odd-numbered lines or even-numbered lines, there is an effect capable of reducing the device costs of a device for providing reducing processing in the subscanning direction by conditional OR processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reduction method for processing a binary image, an image processing apparatus, and a control method for the image processing apparatus.

[0002]

2. Description of the Related Art In general, there is a simple thinning method as a method conventionally used as a method for reducing a binary image. The simple thinning method is a method in which pixels are discarded at predetermined intervals according to a reduction ratio, and a reduced image is represented by remaining pixels. For example, when the image data is reduced to 50%, that is, when the reduction ratio is 50%, a reduced image is obtained by discarding every other pixel.

A disadvantage of this method is that if a thin line or the like represented by one dot corresponds to a pixel to be discarded, the entire line disappears (phenomena such as broken lines and missing dots). The point is that the degree of image quality deterioration is large.

As a method of reducing such image quality deterioration, there is a method of performing an OR process. That is, when forming one dot from two dots in the reduction process,
This is a method using the logical OR result of both dots. According to this method, the line is not lost as in the simple thinning method described above, but at the same time, there may be a problem that a portion that should be left in white becomes black. That is, a line thickening or black crushing phenomenon of image data may occur.

As a method for addressing the problem of image quality deterioration occurring in these reduction methods, there is a conditional OR process. This method is a method of determining the value of pixel data after reduction by the operation shown in the following equation (I).

R (n) = ((NOT (R (n−1))) AND (B (n))) OR (B (n−1)) (I)

Here, R (n) is pixel data after reduction,
R (n-1) is the previous reduced image data, B (n) is the current pixel data of interest, and B (n-1) is the pixel data of the previous pixel. 17 (a),
The relationship is as shown in FIG.

By employing this conditional OR processing, white pixels can be left even in a pixel arrangement that would be crushed by the simple OR method, and image quality degradation can be suppressed.

[0009]

The conditional OR
As can be seen from FIG. 17, the processing is basically processing for reducing two pixels to one pixel. Therefore, when performing the reduction processing, the result pixels that need to be stored for the next calculation are calculated. As shown in FIG. 18, whether the pixel of interest is an even-numbered pixel or an odd-numbered pixel must be stored separately.

That is, when the pixel of interest is an even-numbered pixel,
Since the result of the conditional OR processing is different from that of the odd-numbered case, it is necessary to store the result of the conditional OR processing for each processing.

Here, application of this conditional OR processing to reduction processing in the sub-scanning direction will be considered. Also in this case, as in the case of the reduction processing in the main scanning direction, white pixels can be left even in the case of a pixel arrangement that would be crushed by the simple OR method, and image quality degradation can be suppressed.

However, when this conditional OR processing is applied to the reduction processing in the sub-scanning direction, memory means for storing the results of the conditional OR processing for the even-numbered lines and the odd-numbered lines is required. However, there has been a problem that the apparatus cost is high.

The present invention has been made in view of the above circumstances, and an image reduction method, an image processing apparatus, and an image processing method capable of reducing the apparatus cost when applying conditional OR processing to reduction processing in the sub-scanning direction. An object of the present invention is to provide a control method of an image processing device.

[0014]

According to the present invention, there is provided an image reducing method for reducing a binary image, wherein image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio. Is limited to odd-numbered lines or even-numbered lines.

In an image reduction method for reducing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a magnification point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. And thinning out the image of the line adjacent before or after the scaling point.

In the image reduction method for reducing a binary image, the reduction processing in the sub-scanning direction is performed when the scaling point determined according to the reduction ratio is an odd-numbered line. Is reduced, and a conditional OR process is applied to the even-numbered line next to the odd-numbered line to create a reduced image. If the scaling point is the even-numbered line, the conditional OR process is performed for the even-numbered line. Is applied to generate a reduced image, and the image of the odd-numbered line next to the even-numbered line is thinned out.

In the image reduction method for reducing a binary image, the reduction processing in the sub-scanning direction is performed when the scaling point determined in accordance with the reduction ratio is an even-numbered line. Is reduced, a reduced image is created by applying a conditional OR process to the odd-numbered line next to the even-numbered line, and a conditional OR process is performed for the odd-numbered line when the scaling point is the odd-numbered line. Is applied to create a reduced image, and the image of the even-numbered line next to the odd-numbered line is thinned out.

Prior to the reduction process in the sub-scanning direction,
The reduction processing in the main scanning direction is performed. When the target reduction ratio is 50% or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio, and a conditional OR process is applied to the reduced image. Further, a 50% reduction process is performed to create an image with a desired reduction ratio.

In an image processing apparatus for processing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. Is provided with an image reducing means limited to

In an image processing apparatus for processing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. And an image reduction means for thinning out an image of a line adjacent before or after the scaling point.

In the image processing apparatus for processing a binary image, when the scaling point determined according to the reduction ratio is an odd-numbered line, the image of the odd-numbered line is thinned out, and the image of the odd-numbered line is thinned. A reduced image is created by applying conditional OR processing to the next even-numbered line, and a reduced image is created by applying conditional OR processing to the even-numbered line when the scaling point is the even-numbered line. The image processing apparatus further includes image reduction means for performing reduction processing in the sub-scanning direction by thinning out the image of the odd-numbered line next to the even-numbered line.

In the image processing apparatus for processing a binary image, when the scaling point determined according to the reduction ratio is an even-numbered line, the image of the even-numbered line is thinned out, and the image of the even-numbered line is thinned out. A reduced image is created by applying conditional OR processing to the next odd-numbered line, and a reduced image is created by applying conditional OR processing to the odd-numbered line when the scaling point is the odd-numbered line. The image processing apparatus further includes an image reduction unit that thins out an image of an even-numbered line next to the odd-numbered line and performs a reduction process in the sub-scanning direction.

The image reduction means performs reduction processing in the main scanning direction prior to reduction processing in the sub-scanning direction. When the target reduction ratio is 50% or less, the image reduction unit reduces the sub-scanning direction to a reduction ratio twice as large as the target reduction ratio by simple thinning processing.
A conditional OR process is applied to the reduced image, and a 50% reduction process is further performed to create an image having a target reduction ratio. Further, the image reducing means includes:
When the current processing line is at a point other than the magnification point, the data in the previous line memory is read and then discarded, and the data read from the memory storing the previous reduction result is written back to the memory. .

In the image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory, a previous line memory for storing the binary image data of the previous line, a binary image data for the current processing line, the previous reduced result data read from the reduced result line memory, and a read from the previous line memory. The binary image data of the previous line is input to the conditional OR processing means to perform the conditional OR processing for the current processing line, and the output data of the conditional OR processing means, which is determined according to the reduction ratio and employs the output data of the conditional OR processing means, is used. Control means for limiting the double point to odd-numbered lines or even-numbered lines is provided.

In the image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. In addition to performing conditional OR processing on the lines, the scaling point determined according to the reduction ratio and employing the output data of the conditional OR processing means is limited to odd-numbered lines or even-numbered lines. A control unit is provided for thinning out an image of a line adjacent to the front or rear of the odd-numbered line or the even-numbered line corresponding to the double point.

In the image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. When the conditional OR process is performed on the line, and the scaling point determined according to the reduction ratio is an odd-numbered line, the image of the odd-numbered line is thinned out, and the even-numbered line next to the odd-numbered line is removed. And outputs the reduced data output from the conditional OR processing means,
If the variable power point is an even-numbered line, control means for outputting reduced data output from the conditional OR processing means for the even-numbered line and thinning out an image of an odd-numbered line next to the even-numbered line is provided. It is provided.

In the image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. When the conditional OR processing is performed on the line, and the scaling point determined according to the reduction ratio is an even-numbered line, the image of the even-numbered line is thinned out, and the odd-numbered line next to the even-numbered line is removed. And outputs the reduced data output from the conditional OR processing means,
When the scaling point is an odd-numbered line, control means for outputting reduced data output from the conditional OR processing means for the odd-numbered line and thinning out an image of an even-numbered line next to the odd-numbered line is provided. It is provided.

Further, the control means performs reduction processing in the main scanning direction prior to reduction processing in the sub-scanning direction. When the target reduction ratio is 50% or less, the control unit reduces the sub-scanning direction by a simple thinning process to a reduction ratio twice as large as the target reduction ratio, and reduces the reduced image by 50%. To perform the conditional OR
The conditional OR processing of the processing means is applied to create an image with a target reduction ratio.

In a control method of an image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the condition determined according to the reduction ratio and The scaling point adopting the output data of the attached OR processing means is limited to the odd-numbered line or the even-numbered line.

In a control method of an image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the condition determined according to the reduction ratio and The scaling point that employs the output data of the attached OR processing means is limited to the odd-numbered line or the even-numbered line, and further, the line adjacent to the line before or after the odd-numbered line or the even-numbered line corresponding to the scaling point This is to thin out the images.

In a control method of an image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and a change determined according to the reduction ratio. When the double point is an odd-numbered line, the image of the odd-numbered line is thinned out, reduced data output from the conditional OR processing means is output for the even-numbered line next to the odd-numbered line, and scaling is performed. If the point is an even-numbered line, the reduced data output from the conditional OR processing means for the even-numbered line is used. Outputs data, is obtained by a thinned out the next image of the odd-numbered lines of the even-numbered lines.

In a control method of an image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and a change determined according to the reduction ratio. If the double point is an even-numbered line, the image of the even-numbered line is thinned out, reduced data output from the conditional OR processing means is output for the odd-numbered line next to the even-numbered line, and scaling is performed. If the point is an odd-numbered line, the reduced data output from the conditional OR processing means for the odd-numbered line is used. Outputs data, is obtained by a thinned out the next image of the even-numbered lines of the odd-numbered lines.

Further, in the control method of the image processing apparatus,
Prior to the reduction processing in the sub-scanning direction, the reduction processing in the main scanning direction is performed. In the control method of the image processing apparatus, when the target reduction ratio is 50% or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio. 50
% Of the conditional OR processing means so as to perform% reduction.
An image with a target reduction ratio is created by applying the R process.

[0034]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

FIG. 1 shows a group 3 facsimile apparatus according to one embodiment of the present invention.

In FIG. 1, a system control unit 1 performs a control process of each unit of the group 3 facsimile apparatus and a predetermined group 3 facsimile transmission control procedure process. Stores a control processing program to be executed by the computer and various data necessary for executing the processing program, and also forms a work area of the system control unit 1. The parameter memory 3 is a group 3 facsimile apparatus. The clock circuit 4 is for storing current time information.

The scanner 5 is for reading a document image at a predetermined resolution, the plotter 6 is for recording and outputting an image at a predetermined resolution, and the operation display section 7 is a facsimile apparatus. To operate,
It consists of various operation keys and various indicators.

The image processing section 8 is for performing various image processing such as scaling processing of image data. The encoding / decoding section 9 encodes and compresses an image signal and encodes and compresses the image signal. The image storage device 10 is for decoding the current image information into the original image signal, and the image storage device 10 is for storing a large number of image information in a coded and compressed state.

The group 3 facsimile modem 11 is for realizing a group 3 facsimile modem function. The group 3 facsimile modem 11 has a low-speed modem function (V.21 modem) for exchanging transmission procedure signals and mainly exchanges image information. High-speed modem function (V.17 modem,
V. 34 modem, V.34. 29 modem, V.29. 27ter modem etc.).

The network controller 12 is for connecting this group 3 facsimile apparatus to the analog public network PSTN and has an automatic transmission / reception function.

The system control unit 1, the system memory 2, the parameter memory 3, the clock circuit 4, the scanner 5, the plotter 6, the operation display unit 7, the image processing unit 8, the encoding / decoding unit 9, and the image storage unit 10. , Group 3 facsimile modem 11 and network controller 12 are connected to an internal bus 13, and data exchange between these elements is mainly performed via the internal bus 13.

Data exchange between the network controller 12 and the group 3 facsimile modem 11 is directly performed.

FIG. 2 shows an example of the configuration of the image processing section 8 when a binary image is reduced.

In the figure, the main scanning direction reduction processing section 81
Is to reduce the original binary image data DI in the main scanning direction at a designated reduction ratio by a predetermined method, for example, the above-described conditional OR processing method, and the output result is reduced in the main scanning direction. The data DM is added to the sub-scanning direction reduction processing unit 82.

The sub-scanning direction reduction processing section 82 applies the above-described conditional OR processing method to the input main-scanning direction reduced data DM to reduce the data in the sub-scanning direction at a designated reduction ratio. The output result is output to the next-stage device as reduced data DS. Here, the next-stage device is the encoding / decoding unit 9 when transmitting image information, and is the plotter 6 when recording and outputting.

FIG. 3 shows an example of the configuration of the sub-scanning direction reduction processing section 82.

In the figure, the main scanning direction reduced data DM
Are added to the front line memory 85 for storing the binary image data of the previous line in the conditional OR processing, the conditional OR processing unit 86 for executing the conditional OR processing, and the output circuit 87.

The reduction result line memory 88 stores the output data DK output from the conditional OR processing unit 86 as a processing result immediately before the conditional OR processing.

The output circuit 87 outputs the reduced data DM in the main scanning direction or the output data DK of the conditional OR processing unit 86 to the next-stage device as reduced data DS.

Then, the conditional OR processing unit 86 determines, for the even-numbered lines, the main scanning direction reduced data DM, the previous line data output from the previous line memory 85, and
Based on the previous reduced data DS output from the reduction result line memory 88, the above-described conditional OR processing is executed for each pixel position, and output data DK obtained as a result of the execution is output.

FIG. 4 shows an example of the processing of the sub-scanning direction reduction processing section 82.

First, odd-numbered line processing (processing 101)
Is determined at this time, whether or not the image data for one page is completed (decision 102). If the result of the decision 102 is NO, the even-numbered line processing (processing 103) is executed for the next line I do.

Next, it is determined whether or not the image data for one page has been completed at that time (decision 104).
When the result of step 04 is NO, the process returns to step 101,
The odd-numbered line processing is executed for the next line.

When the result of the judgment 102 is YES, or when the result of the judgment 104 is YES, this processing ends.

FIG. 5 shows an odd-numbered line process (process 10).
1 shows an example.

First, a scaling point calculation (to be described later) according to the reduction ratio is performed (step 201), and it is checked whether or not the line corresponds to a scaling point (decision 202).

If the result of the determination 202 is YES, the main scanning direction reduced data DM is inputted (step 20).
3) The input main scanning direction reduced data DM is stored in the previous line memory 85 (process 204).

At this time, since the image data of the odd-numbered line is thinned out, no image is output (processing 20).
5). Until the input of the main-scanning-direction reduced data DM for one line is completed (the result of the determination 206 is YES), the process returns to the processing 203 and the main-scanning-direction reduced data DM is input.

When the input of the main-scanning-direction reduced data DM for one line is completed and the result of determination 206 is YES, the conditional OR processing is performed on the next even-numbered line. Set the flag (Process 20
7), end the odd-numbered line processing.

If the line is not a variable point and the result of determination 202 is NO, it is checked whether the thinning flag set by the even-numbered line processing (processing 103) is on (determination 20).
8). Judgment 2 when the thinning flag is on
When the result of step 08 is YES, the odd-numbered line is a thinned line, so after turning off the thinning flag (step 209), the process proceeds to step 203, where the odd-numbered line is thinned and the condition OR processing flag is set. , The odd-numbered line processing ends.

When the thinning flag is off and the result of determination 208 is NO, the odd-numbered line is output as it is. That is, the main scanning direction reduced data DM is input (process 210), and the input main scanning direction reduced data DM is output to the next apparatus as reduced data DS (process 211). This operation is repeated until the input of the one-line reduced data in the main scanning direction DM is completed (NO loop of decision 212), the input of the one-line reduced data in the main scanning direction DM is completed, and the result of decision 212 is YES. , The odd-numbered line processing ends.

FIGS. 6 and 7 show an example of the even-numbered line processing (processing 103).

First, a scaling point calculation (described later) according to the reduction ratio is performed (processing 301), and it is checked whether or not the line corresponds to a scaling point (decision 302).

When the result of determination 302 is YES, the main scanning direction reduced data DM is input (step 30).
3) The output data DK output from the conditional OR processing unit 86 is stored in the reduction result line memory 88 (processing 30).
4) At this time, the input reduced data D in the main scanning direction
M is output to the next-stage device as reduced data DS (process 305). This operation is repeated until the input of the one-line reduced data in the main scanning direction DM is completed (N in decision 306).
(O loop) When the input of the main scanning direction reduced data DM for one line is completed and the result of the determination 306 becomes YES, the thinning flag is turned on to thin the next odd-numbered line (process 307). The even-numbered line processing ends.

When the line corresponds to the variable power point and the result of determination 302 is YES,
It is checked whether the conditional OR processing flag set in the odd-numbered line processing is on (decision 31)
0).

When the result of determination 310 is YES, first, the conditional OR processing flag is cleared (processing 3).
11). Next, the main scanning direction reduced data DM is input (processing 312), and the output data DK output from the conditional OR processing unit 86 is stored in the reduced result line memory 88 (processing 313). Part 86
Is output as reduced data DS to the next-stage device (process 314). This operation is repeated until the input of the main-scanning direction reduced data DM for one line is completed (NO loop of decision 315), and the input of the main-scanning reduced data DM for one line is finished, and the result of the decision 315 is Y
When it becomes ES, the even-numbered line processing ends.

If the conditional OR processing flag is OFF and the result of determination 310 is NO, the main scanning direction reduced data DM is input (processing 316), and the conditional OR processing is performed.
The output data DK output from the processing unit 86 is stored in the reduction result line memory 88 (processing 317). At this time, the input reduced data DM in the main scanning direction is sent to the next-stage device.
The data is output as reduced data DS (process 318). This operation is repeated until the input of the one-line reduced data in the main scanning direction DM is completed (NO loop of decision 319), the input of the one-line reduced data in the main scanning direction DM is completed, and the result of decision 319 is YES. , The even-numbered line processing ends.

Now, FIG. 8 shows the state of the reduction operation in the sub-scanning direction by such a sub-scanning reduction process when the reduction ratio is 50%, and FIG. 9 when the reduction ratio is 60%.

As described above, in this embodiment, the lines to which the conditional OR processing is applied are limited to the even-numbered lines. Therefore, the line memory required for the sub-scanning direction reduction processing unit 82 is limited to one. , And the cost of the apparatus can be significantly reduced.

By the way, in the conditional OR processing, in principle,
A reduction operation with a reduction ratio smaller than 50% cannot be performed at a time. Therefore, for example, in a reduction operation with a reduction ratio of 30%, two sub-scanning direction reduction processing units 82 are cascade-connected, and a 60% reduction process is performed by the preceding sub-scanning direction reduction processing unit 82, and then, the subsequent stage. 5 in the sub-scanning direction reduction processing unit 82
This can be dealt with by performing 0% reduction processing.

However, since the conditional OR processing is basically an OR processing, if such a method is adopted, the preservation of the line is not particularly deteriorated, but image quality deterioration such as thickening of the line may occur. There is.

In order to solve such a problem, 50%
When performing a reduction process with a smaller reduction ratio, a reduction ratio that is twice the target reduction ratio is set, a simple thinning process is performed at that reduction ratio, and then a conditional OR process is performed at a 50% reduction ratio. Applicable methods can be adopted.

FIGS. 10 and 11 show an example of the sub-scanning direction reduction processing in this case.

First, it is checked whether or not the reduction ratio is set to 50% or less (determination 401). When the result of determination 401 is NO, the normal reduction processing as shown in FIGS.

When the result of determination 401 is YES, the set reduction ratio is reset to twice (processing 4).
02). For example, when the reduction ratio is set to 30%, the reduction ratio is reset to 60%, which is twice as large.

Next, a scaling point calculation is performed at the reset reduction ratio (process 403), and it is checked whether or not the line corresponds to a scaling point (decision 404). When the result of the determination 404 is YES, the main scanning direction reduced data DM is input (processing 405), and no image is output at this time to perform the simple thinning processing (processing 40).
6). Then, this operation is executed while the reduced data DM in the main scanning direction for one line is input (NO loop of the judgment 407).

If the result of decision 407 is YES, it is checked whether the processing of the image data for one page has been completed (decision 408), and if the result of decision 408 is NO, the process returns to process 403 and the next line Execute the processing for. When the result of determination 408 is YES, this sub-scanning direction reduction processing ends.

When the line does not correspond to the zooming point and the result of determination 404 is NO,
It is checked whether or not the line corresponds to an odd-numbered line after simple thinning (decision 410).

When the result of the judgment 410 is YES, the main scanning direction reduced data DM is input (processing 411).
3) The input main scanning direction reduced data DM is stored in the previous line memory 85 (processing 412).

At this time, since the image data of the odd-numbered line after the thinning process is thinned, no image is output (process 413). Until the input of the one-line reduced data in the main scanning direction DM is completed (result of determination 414 is NO), the process returns to step 411, and the reduced data in the main scanning direction DM
Input.

When the input of the one-line reduced data in the main scanning direction DM is completed and the result of determination 414 is YES, it is checked whether the processing of the image data for one page has been completed (determination 415). When the result of the determination 415 is NO, the process returns to the process 403 to execute the process for the next line. When the result of determination 415 is YES, the sub-scanning direction reduction processing ends.

If the line is an even-numbered line after the simple thinning process and the result of determination 410 is NO, the main scanning direction reduced data DM is input (Step 4).
16), the output data DK output from the conditional OR processing unit 86 is stored in the reduction result line memory 88 (processing 41).
7) At this time, the output data DK of the conditional OR processing unit 86 is output to the next-stage device as reduced data DS (process 418). This operation is repeated until the input of the one-line reduced data DM in the main scanning direction is completed (decision 41).
(NO loop of No. 9) When the input of the reduced data DM in the main scanning direction for one line is completed and the result of the determination 419 becomes YES, the process proceeds to the determination 415 to confirm the end of the page.

FIG. 12 shows a state of the reduction operation when the reduction processing at the reduction ratio of 30% is performed by this method.

When the conditional OR processing unit is formed of a semiconductor integrated device, the number of data input / output channels for processing even-numbered lines and the number of data input / output channels for processing odd-numbered lines are the same. Then, the processing and the circuit configuration when incorporating into the device can be simplified.

In order to do this, as shown in FIG. 13, the number of input channels of the conditional OR processing section 86a includes the main scanning direction reduced data DM, the output data of the previous line memory 85, and the reduced result line. Three channels are provided for inputting the output data of the memory 88, and the output data DK and the reduced data DS of the conditional OR processing circuit 86b for executing the conditional OR processing are output as the number of output channels of the conditional OR processing unit 86a. Therefore, two channels are provided.

For example, when the reduction result is output on the even-numbered line, as shown in FIG.
When the output data DK of the R processing circuit 86b is output as reduced data DS and a normal image is output on an even-numbered line, as shown in FIG. 14, the main scanning direction input to the conditional OR processing circuit 86b The reduced data DM is output as reduced data DS.

When outputting a normal image on the odd-numbered line, as shown in FIG. 15, the output of the reduced result line memory 88 is passed through, and the data is returned to the reduced result line memory 88 as data DK and input. The reduced data DM in the main scanning direction is output as reduced data DS, and the data input from the previous line memory 85 is internally discarded. When the odd-numbered line corresponds to the thinned line, the output of the reduced data DS in FIG. 15 may be stopped.

In FIGS. 13, 14, and 15, the conditional OR processing unit 86a corresponds to the conditional OR processing unit 86 in FIG.

As described above, in this embodiment, the relation of data input / output under each condition is the same, and the conditional OR
The memory access control for the processing unit can be simplified.

Next, the scaling point calculation will be described.

In this scaling point calculation, first, the calculation formula of the scaling factor R is set as the following equation (II).

R = y / x (II)

Therefore, the scaling factor R is determined by changing y while fixing y to a fixed value. For example, when setting the magnification in the range of 12.5% to 100%, when the value of y is fixed at 256, x is set according to the magnification.
Is set to 256 to 2048.

For example, when 50% is set as the scaling factor R, it is set to 256/512 or 51
Whether it is set to 2/1024 can be appropriately determined depending on the precision required for the variable magnification point.

FIG. 16 shows an example of the scaling point calculation processing.

First, a value (magnification ratio value) corresponding to the magnification ratio of the above equation (II) is set in the constant x (step 50).
1), the value of y (25
A value obtained by adding the offset value A to 6) is set (Process 5)
02). Here, the offset value A is for changing the scaling point.

Next, the value of the variable sp is updated to a value obtained by subtracting 256 (step 503), and the value of the updated variable sp is changed to 25.
It is checked whether it is greater than 5 (decision 504). If the result of determination 504 is YES, the point at that time (pixel in the case of scaling in the main scanning direction, line in the case of scaling in the sub-scanning direction) is determined as a scaling point (process 505). . In this case, the target pixel is not output in the case of scaling in the main scanning direction, and the target line is not output in the case of scaling in the sub-scanning direction.

If the result of determination 505 is NO, the point at that time (pixel in the main scanning direction,
(The line in the sub-scanning direction) is determined as the non-magnifying point (process 506), the pixel of interest is output in the case of the magnification process in the main scanning direction, and in the case of the magnification process in the sub-scanning direction. The line of interest is output. Next, the value of the variable sp is
The value is updated to the value obtained by adding the constant x (process 507).

When one scaling point process is completed in this way, it is checked whether or not the image processing has been completed (decision 508). When the result of the decision 508 is NO, the process returns to the process 503, and The processing is executed for the next image data. When the result of determination 508 is YES, this process ends.

Note that the scaling point calculation processing is not limited to the above-described processing, and other well-known methods can be employed.

In the above-described embodiment, the case where the present invention is applied to the group 3 facsimile apparatus has been described. However, the present invention can be appropriately applied to other image processing apparatuses which handle binary images. it can.

[0102]

As described above, according to the present invention,
In an image reduction method for reducing a binary image, a conditional OR
The image is reduced in the sub-scanning direction by the processing, and the scaling point determined according to the reduction ratio is limited to the odd-numbered line or the even-numbered line. Thus, the effect that the apparatus cost of the apparatus realized can be reduced.

In an image reduction method for reducing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a variable point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. In addition, since the image of the adjacent line is thinned out before or after the zoom point, the apparatus cost of the apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced. Get the effect.

In the image reduction method for reducing a binary image, the reduction processing in the sub-scanning direction is performed when the scaling point determined according to the reduction ratio is an odd-numbered line. Is reduced, and a conditional OR process is applied to the even-numbered line next to the odd-numbered line to create a reduced image. If the scaling point is the even-numbered line, the conditional OR process is performed for the even-numbered line. Is applied to generate a reduced image, and the image of the odd-numbered line next to the even-numbered line is thinned out, so that the apparatus cost of the apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing is reduced. The effect that can be obtained.

In the image reduction method for reducing a binary image, the reduction processing in the sub-scanning direction is performed when the scaling point determined in accordance with the reduction ratio is an even-numbered line. Is reduced, a reduced image is created by applying a conditional OR process to the odd-numbered line next to the even-numbered line, and a conditional OR process is performed for the odd-numbered line when the scaling point is the odd-numbered line. Is applied to create a reduced image, and the image of the even-numbered line next to the odd-numbered line is thinned out, so that the apparatus cost of the apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing is reduced. The effect that can be obtained.

Prior to the reduction process in the sub-scanning direction,
Since the reduction processing in the main scanning direction is performed, the effect that the apparatus cost can be reduced is obtained. When the target reduction ratio is 50% or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio, and a conditional OR process is applied to the reduced image. 50 more
Since the image with the target reduction rate is created by performing the% reduction processing, the effect that the reduction processing with a small reduction rate can be realized by applying the conditional OR processing is also obtained.

In an image processing apparatus for processing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a variable point determined in accordance with the reduction ratio is changed to an odd-numbered line or an even-numbered line. Is provided, an effect is obtained that the cost of an apparatus for realizing the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced.

In an image processing apparatus for processing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a variable point determined according to the reduction ratio is set to an odd-numbered line or an even-numbered line. And an image reduction means for thinning out an image of an adjacent line before or after the scaling point is provided, thereby reducing the apparatus cost of an apparatus for realizing reduction processing in the sub-scanning direction by conditional OR processing. The effect that can be obtained.

In the image processing apparatus for processing a binary image, when the scaling point determined according to the reduction ratio is an odd-numbered line, the image of the odd-numbered line is thinned out, and the odd-numbered line is thinned. A reduced image is created by applying conditional OR processing to the next even-numbered line, and a reduced image is created by applying conditional OR processing to the even-numbered line when the scaling point is the even-numbered line. Further, the image processing apparatus includes an image reduction unit that performs reduction processing in the sub-scanning direction by thinning out the image of the odd-numbered line next to the even-numbered line.
The effect that the apparatus cost of the apparatus realized by the processing can be reduced can be obtained.

In the image processing apparatus for processing a binary image, when the scaling point determined according to the reduction ratio is an even-numbered line, the image of the even-numbered line is thinned out, and the image of the even-numbered line is thinned out. A reduced image is created by applying conditional OR processing to the next odd-numbered line, and a reduced image is created by applying conditional OR processing to the odd-numbered line when the scaling point is the odd-numbered line. Further, since an image reducing means for performing reduction processing in the sub-scanning direction by thinning out the image of the even-numbered line following the odd-numbered line is provided, the reduction processing in the sub-scanning direction is conditional O
The effect is obtained that the apparatus cost of the apparatus realized by the R processing can be reduced.

Further, since the image reduction means performs the reduction processing in the main scanning direction prior to the reduction processing in the sub-scanning direction, the effect that the apparatus cost can be reduced is obtained. Further, the image reduction means has a target reduction ratio of 50%.
In the following cases, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio, a conditional OR process is applied to the reduced image, and a further 50% reduction process is performed. Since the image having the reduction rate of is generated, the effect that the reduction processing with a small reduction rate can be realized by applying the conditional OR processing is also obtained. Further, when the current processing line is at a position other than the magnification point, the image reduction unit reads out the data of the previous line memory, discards the data, and stores the data read from the memory storing the previous reduction result in the memory. Since it was written again, all the data input / output relationships under each condition can be made the same,
As a result, there is an effect that the memory access control can be simplified.

In an image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. Control means is provided for performing conditional OR processing on the line and limiting a scaling point determined according to the reduction ratio and employing the output data of the conditional OR processing means to an odd-numbered line or an even-numbered line. Therefore, an effect is obtained that the apparatus cost of an apparatus that realizes the sub-scanning direction reduction processing by the conditional OR processing can be reduced.

In an image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. In addition to performing conditional OR processing on the lines, the scaling point determined according to the reduction ratio and employing the output data of the conditional OR processing means is limited to odd-numbered lines or even-numbered lines. Since control means for thinning out the image of the line adjacent to or before the odd-numbered line or even-numbered line corresponding to the double point is provided, the apparatus cost of the apparatus for realizing the reduction processing in the sub-scanning direction by the conditional OR processing is reduced. The effect that can be obtained.

In an image processing apparatus for processing a binary image, a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. When the conditional OR process is performed on the line, and the scaling point determined according to the reduction ratio is an odd-numbered line, the image of the odd-numbered line is thinned out, and the even-numbered line next to the odd-numbered line is removed. And outputs the reduced data output from the conditional OR processing means,
If the variable power point is an even-numbered line, control means for outputting reduced data output from the conditional OR processing means for the even-numbered line and thinning out an image of an odd-numbered line next to the even-numbered line is provided. Since the apparatus is provided, an effect is obtained that the apparatus cost of an apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced.

In an image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing, and a reduction result for storing output data of the conditional OR processing means A line memory and a front line memory for storing the binary image data of the previous line,
The binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the previous line binary image data read from the previous line memory are input to the conditional OR processing means to perform the current processing. When the conditional OR processing is performed on the line, and the scaling point determined according to the reduction ratio is an even-numbered line, the image of the even-numbered line is thinned out, and the odd-numbered line next to the even-numbered line is removed. And outputs the reduced data output from the conditional OR processing means,
When the scaling point is an odd-numbered line, control means for outputting reduced data output from the conditional OR processing means for the odd-numbered line and thinning out an image of an even-numbered line next to the odd-numbered line is provided. Since the apparatus is provided, an effect is obtained that the apparatus cost of an apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced.

Further, since the control means performs the reduction processing in the main scanning direction prior to the reduction processing in the sub scanning direction, the effect that the apparatus cost can be reduced is obtained. When the target reduction ratio is 50% or less, the control means reduces the sub-scanning direction by a simple thinning process to a reduction ratio twice as large as the target reduction ratio.
Since the conditional OR processing of the conditional OR processing means is applied so as to perform 0% reduction and an image having a target reduction rate is created, the conditional OR processing is applied and the reduction processing with a small reduction rate is performed. Is also achieved.

Further, in the control method of the image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing;
A conditional result OR memory for storing binary image data of a previous line; and a conditional line processing unit for storing binary image data of a current processing line. Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the condition determined according to the reduction ratio and Since the scaling point employing the output data of the attached OR processing means is limited to the odd-numbered line or the even-numbered line, the apparatus cost of the apparatus for realizing the reduction processing in the sub-scanning direction by the conditional OR processing is reduced. The effect that reduction can be obtained is obtained.

In the control method of the image processing apparatus for processing a binary image, the conditional OR processing means for reducing the image in the sub-scanning direction by the conditional OR processing;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the condition determined according to the reduction ratio and The scaling point that employs the output data of the attached OR processing means is limited to the odd-numbered line or the even-numbered line, and further, the line adjacent to the line before or after the odd-numbered line or the even-numbered line corresponding to the scaling point. Since the image is decimated, the apparatus for realizing the reduction processing in the sub-scanning direction by the conditional OR processing Such an effect that it is possible to reduce the strike.

In a control method of an image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR process;
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and a change determined according to the reduction ratio. When the double point is an odd-numbered line, the image of the odd-numbered line is thinned out, reduced data output from the conditional OR processing means is output for the even-numbered line next to the odd-numbered line, and scaling is performed. If the point is an even-numbered line, the reduced data output from the conditional OR processing means for the even-numbered line is used. Data is output and the image of the odd-numbered line next to the even-numbered line is thinned out, so that the apparatus cost of the apparatus for realizing the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced. Get.

Also, in the control method of the image processing apparatus for processing a binary image, a conditional OR processing means for reducing an image in the sub-scanning direction by a conditional OR processing,
A reduced result line memory for storing output data of the processing means, and a previous line memory for storing binary image data of the previous line, wherein the conditional OR processing means comprises: Based on the previous reduction result data read from the line memory and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and a change determined according to the reduction ratio. If the double point is an even-numbered line, the image of the even-numbered line is thinned out, reduced data output from the conditional OR processing means is output for the odd-numbered line next to the even-numbered line, and scaling is performed. If the point is an odd-numbered line, the reduced data output from the conditional OR processing means for the odd-numbered line is used. Data is output and the image of the even-numbered line next to the odd-numbered line is thinned out, so that the apparatus cost of the apparatus that realizes the reduction processing in the sub-scanning direction by the conditional OR processing can be reduced. Get.

Further, in the control method of the image processing apparatus,
Since the reduction processing in the main scanning direction is performed prior to the reduction processing in the sub-scanning direction, the effect that the apparatus cost can be reduced is also obtained. In the control method of the image processing apparatus, when the target reduction ratio is 50% or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio. Since the conditional OR processing of the conditional OR processing means is applied so as to perform 50% reduction and an image with a target reduction rate is created, the conditional OR processing is applied and the reduction processing with a small reduction rate is performed. Is also achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a group 3 facsimile apparatus according to one embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a configuration of an image processing unit 8 when reducing a binary image.

FIG. 3 is a block diagram showing a configuration example of a sub-scanning direction reduction processing unit 82;

FIG. 4 is a flowchart illustrating an example of processing of a sub-scanning direction reduction processing unit 82;

FIG. 5 is a flowchart illustrating an example of odd-numbered line processing.

FIG. 6 is a flowchart illustrating an example of an even-numbered line process.

FIG. 7 is a flowchart illustrating an example of an even-numbered line process (continued).

FIG. 8 is a schematic diagram for explaining a state of a reduction operation in the sub-scanning direction (a reduction ratio of 50%).

FIG. 9 is a schematic diagram (60% reduction ratio) for explaining a state of a reduction operation in the sub-scanning direction.

FIG. 10 is a flowchart illustrating another example of the processing of the sub-scanning direction reduction processing unit.

FIG. 11 is a flowchart (continued) showing another example of the processing of the sub-scanning direction reduction processing unit.

FIG. 12 is a schematic diagram (30% reduction ratio) for explaining a state of a reduction operation in the sub-scanning direction.

FIG. 13 is a block diagram for explaining another configuration example of the conditional OR processing unit.

FIG. 14 is a block diagram for explaining another configuration example of the conditional OR processing unit (continued).

FIG. 15 is a block diagram for explaining another configuration example of the conditional OR processing unit (continued).

FIG. 16 is a flowchart illustrating an example of scaling point calculation processing.

FIG. 17 is a schematic diagram for explaining conditional OR processing.

FIG. 18 is a schematic diagram for explaining how a code sequence different from odd-numbered pixels and even-numbered pixels is created by conditional OR processing.

[Explanation of symbols]

 Reference Signs List 8 image processing section 81 main scanning direction reduction processing section 82 sub scanning direction reduction processing section 85 front line memory 86, 86a conditional OR processing section 86b conditional OR processing circuit 87 output circuit 88 reduction result line memory

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B41J 3/12 MF term (Reference) 2C062 AA24 2C087 AA03 AA18 BA03 BD05 BD06 BD40 5B057 AA01 BA02 BA23 CA02 CA06 CA12 CA16 CB02 CB06 CB12 CB16 CC02 CD06 CD07 CH18 5C076 AA22 BA03 BA06 BA08 BB06 BB08 BB14 CB01 CB05

Claims (25)

[Claims] In an image reduction method for reducing a binary image, image reduction in the sub-scanning direction is performed by conditional OR processing, and a variable point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. An image reduction method characterized in that the method is limited to: 2. An image reduction method for reducing a binary image, wherein image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. Limited to
An image reduction method characterized by thinning out an image of an adjacent line before or after the scaling point. 3. An image reduction method for reducing a binary image, wherein the reduction processing in the sub-scanning direction is performed when the scaling point determined according to the reduction ratio is an odd-numbered line. Is reduced, and a conditional OR process is applied to the even-numbered line next to the odd-numbered line to create a reduced image. If the scaling point is the even-numbered line, the conditional OR process is performed for the even-numbered line. , A reduced image is created, and an image of an odd-numbered line next to the even-numbered line is thinned out. 4. An image reduction method for reducing a binary image, wherein the reduction processing in the sub-scanning direction is performed in a case where a scaling point determined according to a reduction ratio is an even-numbered line. Is reduced, a reduced image is created by applying a conditional OR process to the odd-numbered line next to the even-numbered line, and a conditional OR process is performed for the odd-numbered line when the scaling point is the odd-numbered line. , A reduced image is created, and an image of an even-numbered line next to the odd-numbered line is thinned out. 5. The image reduction according to claim 1, wherein the reduction processing in the main scanning direction is performed prior to the reduction processing in the sub-scanning direction. Method. 6. When the target reduction ratio is 50% or less,
The sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio.
6. An image having a target reduction ratio by applying an R process and further performing a 50% reduction process. Image reduction method described. 7. An image processing apparatus for processing a binary image, wherein image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. An image processing apparatus comprising an image reduction unit for limiting the number of image processing operations. 8. An image processing apparatus for processing a binary image, wherein image reduction in the sub-scanning direction is performed by conditional OR processing, and a scaling point determined according to a reduction ratio is set to an odd-numbered line or an even-numbered line. Limited to
An image processing apparatus comprising: an image reduction unit that thins out an image of an adjacent line before or after the scaling point. 9. An image processing apparatus for processing a binary image, wherein, when the scaling point determined according to the reduction ratio is an odd-numbered line, the image of the odd-numbered line is thinned out, and the odd-numbered line is thinned. A reduced image is created by applying conditional OR processing to the next even-numbered line, and a reduced image is created by applying conditional OR processing to the even-numbered line when the scaling point is the even-numbered line. An image processing apparatus comprising: image reduction means for performing reduction processing in the sub-scanning direction by thinning out an image of an odd-numbered line next to the even-numbered line. 10. An image processing apparatus for processing a binary image, wherein when the scaling point determined according to the reduction ratio is an even-numbered line, the image of the even-numbered line is thinned out, and the image of the even-numbered line is thinned out. A reduced image is created by applying conditional OR processing to the next odd-numbered line, and a reduced image is created by applying conditional OR processing to the odd-numbered line when the scaling point is the odd-numbered line. An image processing apparatus comprising: an image reduction unit that performs reduction processing in the sub-scanning direction by thinning out an image of an even-numbered line next to the odd-numbered line. 11. The image reduction unit according to claim 7, wherein the image reduction unit performs reduction processing in the main scanning direction prior to reduction processing in the sub-scanning direction. Item 11. The image processing device according to Item 10. 12. When the target reduction ratio is 50% or less, the image reduction unit reduces the sub-scanning direction by a simple thinning process to a reduction ratio twice as large as the target reduction ratio. , Apply conditional OR processing and add 50%
12. The image processing apparatus according to claim 7, wherein an image having a target reduction ratio is created by performing a reduction process. 13. When the current processing line is at a position other than the scaling point, the image reduction means reads out data from the previous line memory, discards the data, and reads the data read out from the memory storing the previous reduction result. The data is re-written in the memory.
3. The image processing device according to 2. 14. An image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by conditional OR processing; and a reduction result for storing output data of the conditional OR processing means. A line memory, a previous line memory for storing the binary image data of the previous line, a binary image data of the current processing line, a previous reduced result data read from the reduced result line memory, and a read from the previous line memory. The binary image data of the previous line is input to the conditional OR processing means to perform the conditional OR processing for the current processing line, and the output data of the conditional OR processing means, which is determined according to the reduction ratio and employs the output data of the conditional OR processing means. An image processing apparatus comprising a control unit for limiting a double point to an odd-numbered line or an even-numbered line. 15. An image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing; and a reduction result for storing output data of the conditional OR processing means. A line memory and a previous line memory for storing the binary image data of the previous line, the binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the read from the previous line memory The binary image data of the previous line is input to the conditional OR processing means to perform the conditional OR processing on the current processing line, and the output data of the conditional OR processing means determined according to the reduction ratio is adopted. The scaling point is limited to the odd-numbered line or the even-numbered line, and the odd-numbered line corresponding to the scaling point is further limited. Rui image processing apparatus characterized by comprising a control means for thinning out the image of the line adjacent before or after the even-numbered lines. 16. An image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing; and a reduction result for storing output data of the conditional OR processing means. A line memory and a previous line memory for storing the binary image data of the previous line, the binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the read from the previous line memory The preceding line binary image data is input to the conditional OR processing means to perform conditional OR processing on the current processing line, and when the scaling point determined according to the reduction ratio is an odd-numbered line, The image of the odd-numbered line is thinned out, and the even-numbered line next to the odd-numbered line is output from the conditional OR processing means. And outputs the reduced data that,
If the variable power point is an even-numbered line, control means for outputting reduced data output from the conditional OR processing means for the even-numbered line and thinning out an image of an odd-numbered line next to the even-numbered line is provided. An image processing apparatus comprising: 17. An image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing; and a reduction result for storing output data of the conditional OR processing means. A line memory and a previous line memory for storing the binary image data of the previous line, the binary image data of the current processing line, the previous reduced result data read from the reduced result line memory, and the read from the previous line memory The binary image data of the previous line is input to the conditional OR processing means to perform the conditional OR processing on the current processing line, and when the scaling point determined according to the reduction ratio is an even-numbered line, The image of the even-numbered line is thinned out, and the odd-numbered line next to the even-numbered line is output from the conditional OR processing means. And outputs the reduced data that,
When the scaling point is an odd-numbered line, control means for outputting reduced data output from the conditional OR processing means for the odd-numbered line and thinning out an image of an even-numbered line next to the odd-numbered line is provided. An image processing apparatus comprising: 18. The apparatus according to claim 14, wherein said control means performs reduction processing in the main scanning direction prior to reduction processing in the sub-scanning direction. 18. The image processing device according to item 17. 19. The controller according to claim 19, wherein the target reduction ratio is 50.
% Or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio, and the conditional OR processing means performs conditional reduction so that the reduced image is reduced by 50%. 19. The image processing apparatus according to claim 14, wherein an image having a target reduction ratio is created by applying an OR process. 20. A control method of an image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing; and storing output data of the conditional OR processing means. The conditional OR processing means, the binary image data of the current processing line, and the previous reduction read from the reduction result line memory. Based on the result data and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the output data of the conditional OR processing means determined according to the reduction ratio is output. The control method of the image processing apparatus, characterized in that the scaling point adopting is limited to an odd-numbered line or an even-numbered line. 21. A control method of an image processing apparatus for processing a binary image, comprising: conditional OR processing means for performing image reduction in the sub-scanning direction by conditional OR processing; and storing output data of the conditional OR processing means. The conditional OR processing means, the binary image data of the current processing line, and the previous reduction read from the reduction result line memory. Based on the result data and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the output data of the conditional OR processing means determined according to the reduction ratio is output. The scaling point that adopts is limited to the odd-numbered line or the even-numbered line. Method of controlling an image processing apparatus being characterized in that the thinned out the image before or after the adjacent lines of the eye line or even-numbered lines. 22. A control method of an image processing apparatus for processing a binary image, comprising: conditional OR processing means for performing image reduction in the sub-scanning direction by conditional OR processing; and storing output data of the conditional OR processing means. The conditional OR processing means, the binary image data of the current processing line, and the previous reduction read from the reduction result line memory. Based on the result data and the previous line binary image data read from the previous line memory, conditional OR processing is performed on the current processing line, and the scaling point determined according to the reduction ratio is the odd-numbered line. In this case, the image of the odd-numbered line is decimated, and the even-numbered line following the odd-numbered line is processed by the conditional OR processing means. Outputs the reduced data to be output,
When the scaling point is an even-numbered line, reduced data output from the conditional OR processing means is output for the even-numbered line, and the image of the odd-numbered line next to the even-numbered line is thinned out. A method for controlling an image processing apparatus, comprising: 23. A control method of an image processing apparatus for processing a binary image, comprising: a conditional OR processing means for performing image reduction in the sub-scanning direction by a conditional OR processing; and storing output data of the conditional OR processing means. The conditional OR processing means, the binary image data of the current processing line, and the previous reduction read from the reduction result line memory. Based on the result data and the previous line binary image data read from the previous line memory, a conditional OR process is performed on the current processing line, and the scaling point determined according to the reduction ratio is the even-numbered line. In this case, the image of the even-numbered line is thinned out, and the odd-numbered line next to the even-numbered line is processed by the conditional OR processing means. Outputs the reduced data to be output,
When the variable magnification point is an odd-numbered line, reduced data output from the conditional OR processing means is output for the odd-numbered line, and the image of the even-numbered line next to the odd-numbered line is thinned out. A method for controlling an image processing apparatus, comprising: 24. The image processing according to claim 20, wherein the reduction processing in the main scanning direction is performed prior to the reduction processing in the sub-scanning direction. How to control the device. 25. When the target reduction ratio is 50% or less, the sub-scanning direction is reduced by a simple thinning process to a reduction ratio twice as large as the target reduction ratio.
% Of the conditional OR processing means so as to perform% reduction.
25. The control method for an image processing apparatus according to claim 20, wherein an image having a target reduction ratio is created by applying an R process. .